工字型光纤拉锥的微纳光纤消逝场增强研究
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摘要
利用氢气火焰拉伸法对工字型光纤进行拉锥,制备出结构独特的工字型微纳光纤。这种特殊结构的微纳光纤打破了传统微纳光纤中光场分布的圆对称性,从而使其具备了更强的消逝场。使用这种非圆对称的微纳光纤作为光波导进行了基于吸收光谱的化学物质传感测试,对比同等直径的圆柱状微纳光纤,工字型微纳光纤显示出更高的敏感度和更低的检测极限,在直径2.4μm时已经可以探测到1×10~(-10)mol/L浓度的R6G溶液。使用有限元分析的方法进行了模拟计算,进一步验证了该结构微纳光纤消逝场的增强特性。
Using I-shaped optical fiber as building blocks,I-shaped optical microfiber was fabricated via the employing hydrogen flame stretching method. Comparing with the traditional cylindrical optical microfiber,the I-shaped optical microfiber breaks the circular symmetry and thereby has more stronger evanescent fields. Chemical sensing via absorption detection was used to demonstrate the enhancement effect. R6 G solution with 1×10~(-10) mol/L could be detected in the I-shaped optical microfiber with diameter of 2.4 μm. Moreover,the finite element analysis was used to verify the enhancement characteristic of evanescent fields with this structure.
Using I-shaped optical fiber as building blocks,I-shaped optical microfiber was fabricated via the employing hydrogen flame stretching method. Comparing with the traditional cylindrical optical microfiber,the I-shaped optical microfiber breaks the circular symmetry and thereby has more stronger evanescent fields. Chemical sensing via absorption detection was used to demonstrate the enhancement effect. R6 G solution with 1×10~(-10) mol/L could be detected in the I-shaped optical microfiber with diameter of 2.4 μm. Moreover,the finite element analysis was used to verify the enhancement characteristic of evanescent fields with this structure.
引文
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[2]Tong L,Lou J,Mazur E.Single-mode Guiding Properties of Subwavelength-diameter Silica and Silicon Wire Waveguides.[J].Optics Express,2004,12(6):1025-1035.
[3]Liang W,Huang Y,Xu Y,et al.Highly Sensitive Fiber Bragg Grating Refractive Index Sensors[J].Applied Physics Letters,2005,86(15):151122-151122-3.
[4]Fang X,Liao C R,Wang D N.Femtosecond Laser Fabricated Fiber Bragg Grating in Microfiber for Refractive Index Sensing.[J].Optics Letters,2010,35(7):1007-1009.
[5]Liu Y,Meng C,Zhang A P,et al.Compact Microfiber Bragg Gratings with High-index Contrast[J].Optics Letters,2011,36(16):3115.
[6]Jiang X,Tong L,Vienne G,et al.Demonstration of Optical Microfiber Knot Resonators[J].Applied Physics Letters,2006,88(22):1380.
[7]Xu F,Horak P,Brambilla G.Optical Microfiber Coil Resonator Refractometric Sensor[J].Optics Express,2007,15(12):7888.
[8]Guo X,Tong L.Supported Microfiber Loops for Optical Sensing[J].Optics Express,2008,16(19):14429-14434.
[9]Li Y,Tong L.Mach-Zehnder Interferometers Assembled with Optical Microfibers or Nanofibers[J].Optics Letters,2008,33(4):303.
[10]Li X,Li W,Guo X,et al.All-fiber Hybrid Photon-plasmon Circuits:Integrating Nanowire Plasmonics with Fiber Optics[J].Optics Express,2013,21(13):15698-15705.
[11]Warken F,Vetsch E,Meschede D,et al.Ultra-sensitive Surface Absorption Spectroscopy Using Sub-wavelength Diameter Optical Fibers[J].Optics Express,2007,15(19):11952.
[12]Sirbuly D J,Tao A,Law M,et al.Multifunctional Nanowire Evanescent Wave Optical Sensors[J].Advanced Materials,2006,19(1):61-66.
[13]Zhang L,Wang P,Xiao Y,et al.Ultra-sensitive Microfibre Absorption Detection in a Microfluidic Chip[J].Lab on A Chip,2011,11(21):3720.
[14]Grazia A,Riccardo M,Ciaccheri F L.Evanescent Wave Absorption Spectroscopy by Means of Bi-tapered Multimode Optical Fibers[J].Applied Spectroscopy,1998,52(4):546-551.